Comment # 4 on bug 950569 from Achim Gratz

I am having the same problems on a Dell T20 (both with BIOS version A05 and
A06).  The previous boot entry grub-secureboot works without problems.  I have
not tried non-secure boot yet since that requires changing some more settings
in the BIOS.

> ll /boot/efi/EFI/*
/boot/efi/EFI/boot:
total 1204
-rwxrwxr-x 1 root root 1157056 15. Okt 22:29 bootx64.efi
-rwxrwxr-x 1 root root   71672 15. Okt 22:29 fallback.efi

/boot/efi/EFI/grub:
total 3456
-rwxrwxr-x 1 root root      50  8. Okt 22:29 boot.csv
-rwxrwxr-x 1 root root     155  8. Okt 22:29 grub.cfg
-rwxrwxr-x 1 root root  965472  8. Okt 22:29 grub.efi
-rwxrwxr-x 1 root root 1276328  8. Okt 22:29 MokManager.efi
-rwxrwxr-x 1 root root 1286112  8. Okt 22:29 shim.efi

/boot/efi/EFI/opensuse:
total 3416
-rwxrwxr-x 1 root root      58 15. Okt 22:29 boot.csv
-rwxrwxr-x 1 root root     155 15. Okt 22:29 grub.cfg
-rwxrwxr-x 1 root root  965472 15. Okt 22:29 grub.efi
-rwxrwxr-x 1 root root  200704 15. Okt 22:29 grubx64.efi
-rwxrwxr-x 1 root root 1161312 15. Okt 22:29 MokManager.efi
-rwxrwxr-x 1 root root 1157056 15. Okt 22:29 shim.efi

> cat /boot/efi/EFI/grub/boot.csv 
shim.efi,grub-secureboot

> cat /boot/efi/EFI/opensuse/boot.csv 
shim.efi,opensuse-secureboot

> efibootmgr -v
BootCurrent: 0001
Timeout: 0 seconds
BootOrder: 0000,0001,0008,0009,000A
Boot0000  opensuse-secureboot  
HD(1,GPT,12345678-9abc-def0-1234-56789abcdef0,0x800,0x4e000)/File(\EFI\opensuse\shim.efi)
Boot0001* grub-secureboot      
HD(1,GPT,12345678-9abc-def0-1234-56789abcdef0,0x800,0x4e000)/File(\EFI\grub\shim.efi)
Boot0008* Onboard NIC(IPV4)    
PciRoot(0x0)/Pci(0x19,0x0)/MAC(0123456789ab,0)/IPv4(0.0.0.0:0<->0.0.0.0:0,0,0)AMBO
Boot0009* Onboard NIC(IPV6)    
PciRoot(0x0)/Pci(0x19,0x0)/MAC(0123456789ab,0)/IPv6([::]:<->[::]:,0,0)AMBO
Boot000A* UEFI: Crucial_CT1024M550SSD1 
PciRoot(0x0)/Pci(0x1f,0x2)/Sata(4,32768,0)/HD(1,GPT,12345678-9abc-def0-1234-56789abcdef0,0x800,0x4e000)AMBO

The symptoms are as described in the other reports: the screen goes blank and
nothing happens.  I can Ctrl-Alt-Del most of the time to get another reboot,
but if I pre Enter or do anything else on the keyboard (based on the assumption
that I just don't see anything on the screen) I'll have to switch off.  The
grub.cfg is identical for both versions.  The only other notable difference is
the presence of a grubx64.efi, but I don't think it's even used.